Not sci-fi, since they were all done for the Nibirum Community Atlas, which is all fantasy mapping, but they were done in the general style of planetary-system mapping, so may still be of interest. However, I did a series of maps for said Atlas back in 2018 - Forum thread here, Nibirum Solar System start page here, with a sample map to give you an idea, just for the inner planets:

All these maps are also in my Forum Gallery here.

Here we go again (hopefully with better luck this week though!)...

Sorry, Frosty, I don't.

However, a quick check online shows there are at least two CC3+ maps of the Isle out there, both from 2022. One is by Jason Hibdon, on the Atlas of Mystara website, the other is on the Talaraska blog. In neither case is there an FCW file provided, but it couldn't hurt to contact the people involved and ask nicely!

I'm not sure if either may be on this Forum, or perhaps the Cartographer's Guild, as well.

Just a thought, but did you set up the trees so you can hide the canopies, yet still show where the trunks are for use in ground combat? Of course, that also means you can hide any GM-placed traps under the canopy cover as well 😉!

I don't find it takes quite that long on my PC, but certainly it isn't as quick as "normal" symbols.

I suspect the only way you might speed things up would be to amend every one of the symbols using Symbol Manager in CC3+ so that all parts of the symbol go on one sheet, while it still looks the same. This would prevent adjusting the features of each symbol that are currently on separate sheets using sheet effects, although you could still adjust the appearance of the symbol as a whole using effects on whichever sheet the whole symbol is on.

That would be a lot of work per symbol, and you would be best advised to store the amended versions in a separate, new, symbol catalogue, so as not to change the original symbols in case you might want to use those again, or in case something goes wrong with the changes you've been trying to make.

On the whole, Shessar's excellent artwork options might be preferable all-round, however!